In general, the martensitic transformation in metastable austenite grain in steels during nanoindentation investigation will induce strain burst, also commonly referred as pop-in. However, it is found that the occurrence of pop-in depends on the position of transformed martensite. Different from the martensite transformed beneath the indenter, the martensite transformed adjacent to the indenter may not necessarily lead to an obvious pop-in. Nevertheless, the formation of martensite adjacent to the indenter can alter the mechanical behavior of the austenite phase. Thus, the present work demonstrates that in addition to the detection of pop-in, an investigation on the change of mechanical behavior of austenite phase is necessary to characterize the martensitic transformation during nanoindentation investigation.

Graphic Abstract

中文翻译：

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纳米压痕研究中残余奥氏体晶粒中马氏体相变与应变破裂的相关性

通常，在纳米压痕研究过程中，钢中亚稳态奥氏体晶粒的马氏体相变会引起应变破裂，通常也称为弹入。然而，发现弹出现象的发生取决于相变马氏体的位置。与在压头下方转变的马氏体不同，与压头相邻的转变的马氏体不一定会导致明显的弹出。然而，邻近压头的马氏体的形成可以改变奥氏体相的机械性能。因此，本工作表明，除了检测弹出现象外，还需要对奥氏体相力学行为的变化进行研究，以表征纳米压痕研究过程中的马氏体相变。

图形摘要